Yes, you can if the adaptation is faithful and does a good job of translating the story to a different medium. However, sometimes adaptations make changes that might make it harder to grasp the true essence of the original story.
It depends. A good adaptation usually allows you to get the essence, but a poor one might miss key elements. The quality of the adaptation and the faithfulness to the original story matter a lot.
Sometimes you can. If the adaptation is done well, it can capture the main points and spirit of the story.